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以岩屑薄片为基础,结合侧井曲线分析资料,按Exxon公司经典层序地层模式,对建南构造南、北高点代表井建45井、建42井进行了层序地层划分,共划分4个沉积层序,均为Ⅱ型层序,层序级别相当于四级。并对南北高点进行了层序地层对比,南高点的鲕滩主要发育在层序1、2、3的高位期,北高点的鲕滩主要发育于层序4的海侵期。研究认为:南、北高点鲕滩储层存在差异,南高点的鲕滩可定义为“高位滩”,而北高点的鲕滩定义为“海侵滩”,后者因缺乏表生溶蚀作用而储集性能差;北高点可形成层状白云岩储层,层状白云岩储层发育于层序3的高位晚期,层位上处于北高点鲕粒滩与泥晶灰岩之间。针对南、北高点的储层分布规律,提出南高点应以滚动扩边,打斜井提高产能为主,北高点应以寻找优质白云岩储层为主。
Based on the cuttings slices, combined with the lateral well curve analysis data, according to the Exxon classic sequence stratigraphic model, 45 wells were built for the representative wells in the south and north high points of Jiannan structure, and 42 wells were built for sequence stratigraphic division Four sedimentary sequences are type II sequences, and their sequence levels are equivalent to four levels. The sequence stratigraphy stratigraphic correlation was made between the northern and southern highs. The oolitic beach at the southern peak mainly developed at the high stage of sequence 1, 2 and 3, and the oolitic beach at the northern peak mainly developed at the sequence 4. The study shows that there are differences in the oolitic beach reservoirs in the south and north high points. The oolitic beach in the southern high can be defined as “high beach”, while the oolitic beach in the northern high is defined as “transgressive beach” Dissolution and poor reservoir performance; the highest point in the north can form layered dolomite reservoirs. Layered dolomite reservoirs are developed at the late high stage of sequence 3, and are located on the oolitic beach and micrite limestone between. According to the distribution rules of the reservoirs in the south and north high points, it is proposed that the South High Point should be mainly rolling expanding edge, beating inclined shafts to increase productivity, and the highest point should be looking for high-quality dolomite reservoirs.